Display screen, or portion thereof, having a graphical user interface



FIG. 1 is a front view of a display screen, or portion thereof, having agraphical user interface showing a first embodiment of the new design;and,

FIG. 2 is an enlarged view of the callout region 2 of FIG. 1.

The broken lines of even length showing the remainder of the displayscreen, or portion thereof, having a graphical user interface is forenvironmental purposes only and forms no part of the claimed design. Thebroken lines of uneven length labeled FIG. 2 in FIG. 1 indicate portionsof the graphical user interface that are enlarged for magnificationpurposes in FIG. 2 and form no part of the claimed design.

CLAIM The ornamental design for a display screen, or portion thereof,having a graphical user interface, as shown and described.